| A | B |
| similar | having the same shape |
| ratio | comparison of two like quantities |
| diameter | distance across a circle through the center |
| ratio of simlarity | a ratio comparing the relative sizes of similar figures |
| proportion | the equality of two ratios |
| similar triangles | triangles whose corresponding angles are equal and whose corresponding sides are in proportion |
| radius | the distance from the center of a circle to the circle |
| perimeter | the distance around the outside of a shape |
| dilation | process by which a geometric figure is enlarged or shrunk |
| transform | to change the size or shape of a figure |
| center of the dilation | the origin of the rays passing through the vertices of the dilated images |
| fundamental counting principle | a rule that states if one task can be done p different ways and another can be done q different ways, then both can be done pq different ways |
| factorial | the product of all positive integers from 1 to n |